The so-called subgingival calculus, as the name implies, is the calculus under the gums. Because the plaque under the gums is difficult to be brushed, and if the brushing method is wrong, these dirty things under the gums are even more difficult to completely clean up. Especially for some people with periodontal disease, the periodontal pocket is usually deeper, which is more prone to plaque accumulation, mineralization, and the formation of subgingival calculus.
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